scotland



mos enae of'blastingcxplosives containing nitrogly cerin and gelatinized nitrocellulose, and in which the-ratio of nitroglycerin to nitroct- P-tonis large. c In our prior United States applications Serial Numbers 192,963 and19'2,96 t, filed =-j"-. -.September'2 t, 1917, we have described the manufacture of certain improved blasting explosives in the cold, by the use of a small of'certain gelatinizing accelerants.

maximum output from a given plant. can'be'attained-by this invention with gle 1 creased risks as compared ivith present methods of manufacture by reason of the shorter time. of incorporation required. -..We find that an increased output can be Obtained by the-utilization of small proportions of the -0rder:0f0.1' to 1 per cent. of certain of the applications, and using elevated tempera- V tures e. g'., the usual service method of Working, viz.-, C. to C., the increased output arising from the fact that the time re-. quired for gelatinization is greatly reduced.

The invention therefore consists in employing inthe manufacture of blasting exf f plosives a small proportion of the order of 0.1 to 1 per cent. calculated on the nitroglycerin-of' one or more members of the follow- 7 ing classes, the gelatinization being effected w th elevation of temperature, preferably 3 such as is em loyedin the usual service method of making blasting gelatin andlike explosives viz about 60 C. to 70 C. zp 1. Urethanes, or esters of carbaminic acid. 2. Anilids. 1'3. Substituted ureas. v '4. Condensation products of glycerol'and 'otherl glyhydric alcohols with aldehydes. 5. mologues of oxanilic ester.

6; Aromatic bodies soluble in nitroglycerin, e'. g.',"mono-, dior tri-nitrotuluene, mono-nitro-naphthalene, di nitro benzene, 56 nitro-xylenes, or mixtures of these bodies.

Specification o! Letters-Pate 'fproportion of the'order of 0.1 to 1 per cent.

"'- '-'-It""isfin"somecases desirable-to obtaintho- ,classes 'of substancesdescribcdlin our prior Patented July 22, 1919.

Theabove-men ioned organic bodies 'and their chemical. equivalents for the purposes.- of this invention, or mixtures thereof, areherein collectively referred to as organic accelerants for the gelntinization. Some of these, including those numbered from l to 5 inclusive, are both accelerants of gelatinization and stabilizers.

In carrying this invention into efi'ect in one form, 1W0 dissolve a small quantity .of 5

'one of the above accelerating agents in the nitroglyccrin'in a proportion varying from 0.1 to l-per cent; calculatcd on the nitroglycerin, according to the gelatin'izing power oi-f the articular substance selected, which must be etermined experimentally in each case. ie stir the nitrocellulose into the nitroglycerm solution, add theflother in' dients, if

any, and complete the mi xingtin the usual 1 manner, employing the ordinary-elevation of tempcraturecof, the usual service method,

v17... 60 C. to 70 (1.; and we findthat a good blasting explosive is thus prepared. .in a

shortertime thanhas hitherto been possiblei ll'e find that \vhile ordinary blasting gela- V tin of the followmg'composition, via,

Nitroglycerin .L 90.6% Xitrmcott'on... Q. 8.8%

Calciumcarbonate- 0.6%

prepared by the usual service method at 50 C. to 70 C. requires about 7 5 minutes for gelntinization, the corresponding modified blasting gelatin of the following compo 9 sition, ma, 0

Nitro lyoerin 91.6% Solub e nitrocellulose 7.5% Formanilid 0.2} 0 Form-o-toluidid 0.1 Calcium carbonate-- 0.6% and repared by the usual service method at 60 to 70 C., has the gelatinization completed in 30 minutes.

Again in the case of afielignite, if an ordi- 1 nary gelignite ofthe 'fo owing composition,

Nitroglycerin 61.1%- Nitro'cottons 3.8% Wood meal.. 7.2%

7 Potassium nitrates-s 27.6%

Calcium carbonate; 0.3% p be prepared is the usual scrvice'method at 60 c. to 70? it requires about 7 5 minutes lfied gelignite i'samb v gag f fi t of g 5%: teiiged bu r saidiriv'ention-andth mamier'iu- .45

i"? 3'; which it IS gel-formed, we declare that Fomttolaizfir II": .1} 03% what we chum Calcium carbonate b3 4, The e e eee r blame v 10 Y s1 ves contau m rutroglycerm an gelatiat 1d reparedby theusual service method atd n1trocelli'ilose,-'-' consistin in incqrppto C.; completes g'elatinizution ih' r ng a proportion of the or er of 0.1 to' l' about 35 i t s; e j per cent. calculated on the nitroglycerin of Q The following. are further e ramples of an orgunic ccelerzmr for the gelz tir iziit1on; lfi i l explosives hi h yb prepared the gelatimzution being efrIected with elevaaccording-t6 this invention at the usual cle.-- of f P j FH tune factor f ini vatedtempemtures, and conteinihgarorimtic- CPFPOFIXUOH elng thereby reduced, Sllbiitfllhr nitro bodies soluble in nitroglycerin t-lally as described.

Nitr0glycerin; L- 89.8% Soluble nitrocellulossLLJ 8.7% Li uid trinitrotolueneL-i; 9.9%"

ciunrcarhonate 0.6% f

a 60.5% 4 Soluble nitrocellulose;.... 313% l ittfil' "arbo flate;;

oir ofithese oompos oselyjto-thasepbove indicated-respectively. TIE-,gtdtlj-rdild times oflatinizi-ng thusjkrequirecl are of great bene t from the Pgiufiof yiew-of reductioii ofthe inanfacturmgrisls as coniparedwith present processes, gs-theso practically varproportionally 'e w m nitrocellulose,

glycerin prior to incorporation with the nitrocellulose asmuil proportion of the order of 0.1 to 1 per cent. calculated on the" t itions correspond very turehttei'iied hy the mass during incorporatiou nmiythus tend 'to increased'l'safety.

2. The manufacture of-h'lastihg eiplosiveia contuinin nitroglycerin; and gelatimized by dissolving in the nifirb- 6.0

nitroglycerin o f-au. orgauic acceleraint for the gelultinigzation, anduncorporatingthe I other ingredmntswith this solution at an ele-J rated temperature, whereby the time factor.' of gelutinizationis 'rduced.

- 3. In the'manufacture'of blastiiig lization of an organic accelerant for the ge j lutiniza'tion. which possesses also stabilizing" 2 properties. In testimony whereof we have signed our names to this specification.

of gelatin-izin ghavelo 

